本文所说的正交场是指重力场（或匀强电场）与匀强磁场组成的正交场．在一些复习资料或一些省市自行编制的考题中，经常遇到涉及带电粒子在相互正交的重力场和匀强磁场中的运动问题．我们在这里并不评说这类习题是否超纲，或由此设计的一些练习题是否合理，本文的目的在于向读 The orthogonal field referred to in this paper refers to the orthogonal field consisting of a gravitational field (or a uniform electric field) and a uniform magnetic field. In some review materials or questions compiled by some provinces and cities, there are often problems involving the movement of charged particles in mutually orthogonal gravitational fields and uniform magnetic fields. We are not here to comment on whether such exercises are beyond the scope of the class, or whether some of the exercises designed from it are reasonable. The purpose of this article is to read